EP0878838B1 - Nouveau procédé de polissage mécanochimique de couches de matériaux semiconducteurs ou isolants - Google Patents

Nouveau procédé de polissage mécanochimique de couches de matériaux semiconducteurs ou isolants Download PDF

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Publication number
EP0878838B1
EP0878838B1 EP98400715A EP98400715A EP0878838B1 EP 0878838 B1 EP0878838 B1 EP 0878838B1 EP 98400715 A EP98400715 A EP 98400715A EP 98400715 A EP98400715 A EP 98400715A EP 0878838 B1 EP0878838 B1 EP 0878838B1
Authority
EP
European Patent Office
Prior art keywords
silicon
colloidal silica
suspension
chemical
polishing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP98400715A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0878838A2 (fr
EP0878838A3 (fr
Inventor
Eric Jacquinot
Maurice Rivoire
Catherine Euvrard
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
EMD Performance Materials Corp
Original Assignee
Clariant Finance BVI Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Clariant Finance BVI Ltd filed Critical Clariant Finance BVI Ltd
Priority to EP01101577A priority Critical patent/EP1111023B1/fr
Publication of EP0878838A2 publication Critical patent/EP0878838A2/fr
Publication of EP0878838A3 publication Critical patent/EP0878838A3/fr
Application granted granted Critical
Publication of EP0878838B1 publication Critical patent/EP0878838B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10P—GENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10
    • H10P52/00—Grinding, lapping or polishing of wafers, substrates or parts of devices
    • H10P52/40—Chemomechanical polishing [CMP]
    • H10P52/402—Chemomechanical polishing [CMP] of semiconductor materials
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10P—GENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10
    • H10P90/00—Preparation of wafers not covered by a single main group of this subclass, e.g. wafer reinforcement
    • H10P90/12—Preparing bulk and homogeneous wafers
    • H10P90/129—Preparing bulk and homogeneous wafers by polishing
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B33/00—Silicon; Compounds thereof
    • C01B33/113—Silicon oxides; Hydrates thereof
    • C01B33/12—Silica; Hydrates thereof, e.g. lepidoic silicic acid
    • C01B33/14—Colloidal silica, e.g. dispersions, gels, sols
    • C01B33/141—Preparation of hydrosols or aqueous dispersions
    • C01B33/142—Preparation of hydrosols or aqueous dispersions by acidic treatment of silicates
    • C01B33/143—Preparation of hydrosols or aqueous dispersions by acidic treatment of silicates of aqueous solutions of silicates
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09G—POLISHING COMPOSITIONS; SKI WAXES
    • C09G1/00—Polishing compositions
    • C09G1/02—Polishing compositions containing abrasives or grinding agents
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K3/00—Materials not provided for elsewhere
    • C09K3/14—Anti-slip materials; Abrasives
    • C09K3/1454—Abrasive powders, suspensions and pastes for polishing
    • C09K3/1463—Aqueous liquid suspensions
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10P—GENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10
    • H10P52/00—Grinding, lapping or polishing of wafers, substrates or parts of devices
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10P—GENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10
    • H10P52/00—Grinding, lapping or polishing of wafers, substrates or parts of devices
    • H10P52/40—Chemomechanical polishing [CMP]
    • H10P52/403—Chemomechanical polishing [CMP] of conductive or resistive materials
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10P—GENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10
    • H10P90/00—Preparation of wafers not covered by a single main group of this subclass, e.g. wafer reinforcement
    • H10P90/12—Preparing bulk and homogeneous wafers
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10P—GENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10
    • H10P95/00—Generic processes or apparatus for manufacture or treatments not covered by the other groups of this subclass
    • H10P95/06—Planarisation of inorganic insulating materials
    • H10P95/062—Planarisation of inorganic insulating materials involving a dielectric removal step

Definitions

  • the present invention relates to a new polishing process mechano-chemical of semiconductor or insulating materials used during the manufacture of integrated circuits.
  • a first profession is the manufacture of plates for integrated circuits, that is to say the manufacture of silicon wafers. This is how that in this type of industry, we grow a silicon crystal, which we cut then in plates about 750 micrometers thick, which are then subjected to polishing so as to obtain a blank silicon wafer polished. However, this type of industry does not manufacture integrated circuits and these plates for integrated circuits are sold to circuit manufacturers integrated.
  • US-A-3,170,273, US-A-4,664,679, US-A-4.117.093 and EP-A-0.684.638. describe the polishing of the initial silicon plates obtained at from the full crystal bar that is cut to obtain plates for integrated circuits.
  • the second profession that of the manufacturers of integrated circuits, is to then realize the integrated circuits, from the plates for integrated circuits obtained from the above-mentioned manufacturers.
  • the realization of integrated circuits involves in particular the following steps:
  • the entire surface of the circuit boards integrated is oxidized to obtain an insulating layer.
  • the areas thus etched in hollow are called zones active.
  • a new oxidation called "gate oxidation”.
  • An insulation is then deposited, and proceed to a new photolithography to find again the level of the original silicon wafer. In these locations, we make a deposition of a metal such as tungsten.
  • the present invention relates to polishing at this level of integrated circuit design, as well as further development.
  • steps of variable height are mainly generated by the engraving steps so hollow followed by a regular deposit. Reducing the dimensions of the transistors requires smoothing these reliefs, because they can cause difficulties of alignment (focusing during photolithography), problems of continuity of materials during deposits or residues of materials when etching these materials.
  • the planarization is carried out mainly by mechanical-chemical polishing of the various layers deposited. The thickness remaining after polishing of these insulating deposits, semiconductors or conductors affects the electrical characteristics of integrated circuits.
  • the manufacture of integrated circuits is, to date, carried out on plates with a diameter of 200 mm, with 50 to 200 circuits per plate next their size.
  • aqueous suspensions of colloidal silica of basic pH the most often between pH 9 and pH 12.5.
  • the pH of these aqueous suspensions of colloidal silica was made basic by the addition of metal hydroxide alkali such as sodium hydroxide or potassium hydroxide, or by the addition of a soluble amine in water (see in particular M.T. Bohr et al, WO-A-9627206, M. Motoshu and al, US-A-5,376,222, A.V. Gelatos et al, US-A-5,324,690, R. L. Lachapelle, US-A-3,328,141, Yamamichi et al., JP-A-07074313, Watanabe et al., JP-A-07249600).
  • EP-A-0,745,656 describes the polishing of insulating semiconductor substrate using an abrasive composition containing a mixture of aluminum oxide, silica and cerium oxide in the presence of a stabilizing agent.
  • EP-A-0.363.100 discloses selective polishing between a surface comprising
  • the plaintiff's main goal is to put a polishing process that provides an improvement in the uniformity of polishing layers of previously cited materials installed on plates for integrated circuits, used as semiconductors or insulators in the manufacture of integrated circuits.
  • polishing can be carried out on full plate (see figures la and lb) or plate with reliefs (see Figures lc and Id), so to smooth out these reliefs.
  • silicon-based or doped silicon-based materials such as polycrystalline silicon, epitaxial silicon, amorphous silicon, glass of phosphosilicate, or borophosphosilicate glass, the latter two being doped silicon oxide base, excluding the initial silicon used in the manufacture of plates for integrated circuits.
  • a colloidal silica suspension in particular a suspension comprising (or preferably essentially consisting of) fine individualized particles of non-silica linked together by siloxane bonds and used in a neutral or close to neutrality, considerably improved the uniformity of polishing, while maintaining a good attack speed, as well as excellent leveling and surface qualities, especially near absence of roughness.
  • abrasive which comprises an aqueous suspension at a pH of between 6 and 8 preferably containing silica particles individualized colloidal compounds, not bound together by siloxane the chemical-mechanical polishing of a layer of semiconductor material such as that polycrystalline silicon, silicon monocrystalline epitaxial, silicon amorphous or insulating material such as phosphosilicate glass or glass borophosphosilicate used in the manufacture of integrated circuits, the exception of the initial silicon used in the manufacture of the plates for integrated circuits, as well as a method of mechanical-chemical polishing of a layer of semiconductor material such as polycrystalline silicon, silicon monocrystalline epitaxial, amorphous silicon or insulating material such as the phosphosilicate glass or borophosphosilicate glass, used in the semiconductor microelectronics industry, with the exception of silicon initial method used in the manufacture of integrated circuit boards, in which abrasion of the layer of semiconductor material or insulating material by rubbing said layer with a fabric impregna
  • This chemical-mechanical polishing can intervene at different stages of the manufacture of integrated circuits, in particular in lateral isolation of the transistors, in the fabrication of transistor gates, in the manufacture of dielectric interconnections.
  • This chemical-mechanical polishing can also intervene on full plate or plate with reliefs, to flatten these.
  • silicon base such as polycrystalline silicon, epitaphoxy silicon or amorphous silicon, or based on doped silicon oxide, such as glass of phosphosilicate (or PSG) or borophosphosilicate glass (BPSG)
  • Aqueous suspensions of colloidal silica used preferably have individual particle diameters of between 3 and 250 nm in particular between 7 and 150 nm, particularly between 10 and 100 nm.
  • Preferred aqueous colloidal silica suspensions according to the invention are obtained, either by neutralization of alkaline silica sols, in sodium or potasium, by an acid such as hydrochloric acid, nitric acid or sulfuric acid, either by neutralization of a of acidic silica sol with soda, potash or ammonia, preferably by potassium hydroxide and ammonia, and especially by ammonia.
  • aqueous suspensions with a neutral pH are used. or between 6 and 8, especially between 6.5 and 7.5.
  • the diameters of the elementary particles of colloidal silica suspensions are between 3 and 250 nm, particularly between 10 and 100 nm.
  • the weight concentration of the product of polishing is 5 to 50%, preferably 15 to 40%.
  • a main advantage of the invention is the improvement of the uniformity of chemical mechanical polishing of layers of semiconductor material such as polysilicon (polycrystalline silicon) or insulators doped silicon oxide base such as borosilicate glass (BPSG) using aqueous suspensions of colloidal silica at pH neutral or close to neutrality.
  • semiconductor material such as polysilicon (polycrystalline silicon) or insulators doped silicon oxide base such as borosilicate glass (BPSG) using aqueous suspensions of colloidal silica at pH neutral or close to neutrality.
  • This improvement can, for example, be essentially demonstrated by polishing etching uniformity tests while maintaining an acceptable etching rate of the semiconductor material.
  • suspensions aqueous pH of between 6 and 8 colloidal silica, particular consisting of individualized particles, not bound together by siloxane bonds, have a very good stability over time, from which results the absence of sedimentation of the particles during storage time.
  • the present application finally relates to an abrasive for the chemical-mechanical polishing of a layer of semiconductor material based silicon such as polycrystalline silicon, epitaxial silicon or silicon amorphous or insulators based on doped silicon oxide such as glass of phosphosilicate (PSG) or borophosphosilicate glass (BPSG), with the exception of the initial silicon used in the manufacture of the plates for integrated circuits, comprising a fabric impregnated with a liquid composition abrasive containing an aqueous suspension of colloidal silica, comprising particles individualized not bound together by siloxane bonds, of diameter between 3 and 250 nanometers, with a pH of between 6 and 8.
  • a layer of semiconductor material based silicon such as polycrystalline silicon, epitaxial silicon or silicon amorphous or insulators based on doped silicon oxide such as glass of phosphosilicate (PSG) or borophosphosilicate glass (BPSG)
  • PSG phosphosilicate
  • BPSG borophosphosilicate glass
  • Figure la illustrates the state of a full plate coated with polysilicon before polishing, while the figure lb illustrates the state of this plate after polishing.
  • Figures lc and Id illustrate the state of a similar plate but with reliefs. These reliefs were dug by photolithography.
  • polishing with abrasives based on suspensions aqueous properties close to the neutrality of colloidal silica.
  • BPSG borophosphosilicate glass
  • Example of polishing borophosphosilicate glass (BPSG) at a concentration of 4.4% boron and 4.7% phosphorus with abrasives basic aqueous suspensions of colloidal silica.
  • BPSG borophosphosilicate glass
  • silica suspensions colloidal pH of between 6 and 8 makes it possible to obtain a good uniformity of polishing on both the polysilicon and the BPSG while retaining a good attack speed, a very good surface condition of the plate and excellent planarization.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Dispersion Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Mechanical Treatment Of Semiconductor (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Silicon Compounds (AREA)
EP98400715A 1997-04-07 1998-03-26 Nouveau procédé de polissage mécanochimique de couches de matériaux semiconducteurs ou isolants Expired - Lifetime EP0878838B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP01101577A EP1111023B1 (fr) 1997-04-07 1998-03-26 Suspension aqueuse neutre de silice colloidale

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9704207 1997-04-07
FR9704207A FR2761629B1 (fr) 1997-04-07 1997-04-07 Nouveau procede de polissage mecano-chimique de couches de materiaux semi-conducteurs a base de polysilicium ou d'oxyde de silicium dope

Related Child Applications (1)

Application Number Title Priority Date Filing Date
EP01101577A Division EP1111023B1 (fr) 1997-04-07 1998-03-26 Suspension aqueuse neutre de silice colloidale

Publications (3)

Publication Number Publication Date
EP0878838A2 EP0878838A2 (fr) 1998-11-18
EP0878838A3 EP0878838A3 (fr) 1998-12-16
EP0878838B1 true EP0878838B1 (fr) 2005-03-16

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Application Number Title Priority Date Filing Date
EP98400715A Expired - Lifetime EP0878838B1 (fr) 1997-04-07 1998-03-26 Nouveau procédé de polissage mécanochimique de couches de matériaux semiconducteurs ou isolants
EP01101577A Expired - Lifetime EP1111023B1 (fr) 1997-04-07 1998-03-26 Suspension aqueuse neutre de silice colloidale

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EP01101577A Expired - Lifetime EP1111023B1 (fr) 1997-04-07 1998-03-26 Suspension aqueuse neutre de silice colloidale

Country Status (10)

Country Link
US (1) US6126518A (enExample)
EP (2) EP0878838B1 (enExample)
JP (1) JP4233629B2 (enExample)
KR (1) KR100510951B1 (enExample)
CN (1) CN1152416C (enExample)
AT (2) ATE527211T1 (enExample)
DE (1) DE69829329T2 (enExample)
FR (1) FR2761629B1 (enExample)
MY (1) MY119523A (enExample)
SG (1) SG77633A1 (enExample)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011079694A1 (de) 2011-07-25 2013-01-31 Carl Zeiss Smt Gmbh Verfahren zum Polieren einer Schicht aus amorphem Silizium

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FR2781922B1 (fr) 1998-07-31 2001-11-23 Clariant France Sa Procede de polissage mecano-chimique d'une couche en un materiau a base de cuivre
FR2785614B1 (fr) * 1998-11-09 2001-01-26 Clariant France Sa Nouveau procede de polissage mecano-chimique selectif entre une couche d'oxyde de silicium et une couche de nitrure de silicium
FR2792643B1 (fr) * 1999-04-22 2001-07-27 Clariant France Sa Composition de polissage mecano-chimique de couches en un materiau isolant a base de polymere a faible constante dielectrique
JP2002050594A (ja) * 2000-08-04 2002-02-15 Fuso Chemical Co Ltd コロイド状シリカスラリー
FR2819245B1 (fr) * 2001-01-09 2004-11-26 Clariant Nouvelles suspensions aqueuses de silice colloidale anionique de ph neutre et leur procede de preparation, et leurs applications
FR2819244B1 (fr) * 2001-01-09 2003-04-11 Clariant France Sa Nouvelles suspensions aqueuses de silice colloidale anionique de ph neutre et leur procede de preparation, et leurs applications
US6939203B2 (en) * 2002-04-18 2005-09-06 Asm Nutool, Inc. Fluid bearing slide assembly for workpiece polishing
EP1362827B1 (en) * 2002-05-16 2008-09-03 Micronit Microfluidics B.V. Method of fabrication of a microfluidic device
US20070286773A1 (en) * 2002-05-16 2007-12-13 Micronit Microfluidics B.V. Microfluidic Device
JP2004165613A (ja) * 2002-06-03 2004-06-10 Shipley Co Llc 電子デバイスの製造
KR101004525B1 (ko) * 2002-08-19 2010-12-31 호야 가부시키가이샤 마스크 블랭크용 글래스 기판 제조 방법, 마스크 블랭크제조방법, 전사 마스크 제조 방법, 반도체 디바이스제조방법, 마스크 블랭크용 글래스 기판, 마스크 블랭크,및 전사 마스크
FR2857895B1 (fr) * 2003-07-23 2007-01-26 Soitec Silicon On Insulator Procede de preparation de surface epiready sur films minces de sic
US20080220610A1 (en) * 2006-06-29 2008-09-11 Cabot Microelectronics Corporation Silicon oxide polishing method utilizing colloidal silica
EP2063461A4 (en) * 2006-09-13 2010-06-02 Asahi Glass Co Ltd POLISHING AGENT FOR AN INTEGRATED SEMICONDUCTOR ELEMENTS, POLISHING METHOD AND METHOD FOR PRODUCING AN INTEGRATED SEMICONDUCTOR EQUIPMENT
JP4411331B2 (ja) * 2007-03-19 2010-02-10 信越化学工業株式会社 磁気記録媒体用シリコン基板およびその製造方法
US8540894B2 (en) * 2007-09-28 2013-09-24 Nitta Haas Incorporated Polishing composition
CN107953225A (zh) * 2016-10-14 2018-04-24 上海新昇半导体科技有限公司 半导体晶圆的抛光方法
JP7528681B2 (ja) * 2020-09-29 2024-08-06 住友金属鉱山株式会社 ＳｉＣ多結晶基板の研磨方法
CN113045992A (zh) * 2021-03-23 2021-06-29 广东精坚科技有限公司 一种中性抛光液及其制备方法
CN114744065B (zh) * 2022-03-23 2024-06-14 中国电子科技集团公司第十一研究所 台面结构芯片的非接触式光刻方法

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011079694A1 (de) 2011-07-25 2013-01-31 Carl Zeiss Smt Gmbh Verfahren zum Polieren einer Schicht aus amorphem Silizium

Also Published As

Publication number Publication date
SG77633A1 (en) 2001-01-16
KR100510951B1 (ko) 2005-11-21
EP0878838A2 (fr) 1998-11-18
FR2761629B1 (fr) 1999-06-18
EP0878838A3 (fr) 1998-12-16
DE69829329D1 (de) 2005-04-21
DE69829329T2 (de) 2006-04-13
KR19980081128A (ko) 1998-11-25
ATE291277T1 (de) 2005-04-15
CN1152416C (zh) 2004-06-02
CN1208248A (zh) 1999-02-17
JP4233629B2 (ja) 2009-03-04
ATE527211T1 (de) 2011-10-15
FR2761629A1 (fr) 1998-10-09
EP1111023A2 (fr) 2001-06-27
HK1018540A1 (en) 1999-12-24
EP1111023A3 (fr) 2008-01-23
EP1111023B1 (fr) 2011-10-05
MY119523A (en) 2005-06-30
JPH10308379A (ja) 1998-11-17
US6126518A (en) 2000-10-03

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